Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image of a sequence of a displayscreen or portion thereof with transitional graphical user interfaceaccording to the claimed design;

FIG. 2 is a front view of a second image of the sequence according tothe claimed design;

FIG. 3 is a front view of a third image of the sequence according to theclaimed design; and,

FIG. 4 is a front view of a fourth image of the sequence according tothe claimed design.

The grayscale background feature of the graphical user interface isclaimed subject matter.

The longer-length broken-line showing of a display screen and theintermediate-length broken-line showing of a display screen boundary,are included for the purpose of illustrating environmental structure andform no part of the claimed design. The remaining broken lines portrayelements of the graphical user interface that are excluded from theclaim.

The appearance of the transitional image transitions between the imagesshown in FIGS. 1-4. The process or period in which one image transitionsto another forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.